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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.mahout.cf.taste.recommender;

import org.apache.mahout.cf.taste.common.TasteException;
import org.apache.mahout.common.LongPair;

/**
 * 

* Interface implemented by "user-based" recommenders. *

*/ public interface UserBasedRecommender extends Recommender { /** * @param userID * ID of user for which to find most similar other users * @param howMany * desired number of most similar users to find * @return users most similar to the given user * @throws TasteException * if an error occurs while accessing the {@link org.apache.mahout.cf.taste.model.DataModel} */ long[] mostSimilarUserIDs(long userID, int howMany) throws TasteException; /** * @param userID * ID of user for which to find most similar other users * @param howMany * desired number of most similar users to find * @param rescorer * {@link Rescorer} which can adjust user-user similarity estimates used to determine most similar * users * @return IDs of users most similar to the given user * @throws TasteException * if an error occurs while accessing the {@link org.apache.mahout.cf.taste.model.DataModel} */ long[] mostSimilarUserIDs(long userID, int howMany, Rescorer rescorer) throws TasteException; }




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